Examine source code of FFBE Preview

{
  "name": "FFBE Preview",
  "short_name": "FFBE Preview",
  "manifest_version": 2,
  "description": "View FFBE Builds inline from FFBE Equip.",
  "version": "0.4",
  "homepage_url": "https://github.com/NullParameter/ffbebuilds",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "FFBE Preview"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "app/lib/jquery-3.2.1.min.js",
      "app/lib/browser-polyfill.min.js",
      "app/scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "app/lib/jquery-3.2.1.min.js",
        "app/lib/browser-polyfill.min.js",
        "app/lib/exportBuildAsImage.js",
        "app/scripts/ffbebuilds.js"
      ],
      "css": [
        "app/styles/ffbebuilds.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://*/*",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    "app/scripts/*"
  ]
}